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SUMMARY:From production to dissipation of Reynolds stress in the turbulent
  channel flows at high Re - Myoungkyu Lee (University of Alabama at Tuscal
 oosa)
DTSTART:20220329T080000Z
DTEND:20220329T083000Z
UID:TALK171137@talks.cam.ac.uk
DESCRIPTION:We investigate the lifecycle of Reynolds stress in the turbule
 nt channel flows at a high Reynolds number. Each term in the Reynolds stre
 ss transport equation is spectrally decomposed to uncover the contribution
  of mean and turbulence at different length scales and wall-normal distanc
 es. The streamwise-elongated large-scale structures have important contrib
 utions to the production of Reynolds stress in the outer region and transp
 ort of Reynolds stress to the near-wall region. In general\, inter-scale t
 ransfer mechanisms enhance the isotropy in scales and its direction is fro
 m large-scale to small-scale except for the near-wall region where inverse
  energy cascade is observed. The inter-component transfer mechanism exhibi
 ts the multi-step behavior when it transfers from streamwise fluctuations 
 to wall-normal and spanwise fluctuations. Finally\, dissipation spectra be
 come isotropic\, and their scale grows with y^{1/4}.
LOCATION:Seminar Room 1\, Newton Institute
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